How to find the correct information for creating shortcut ?
right click ony (almost) any option and click edit source.

the name of the operator is what you need. (n.b. I am no python expert so I may not have the right terminology or way of doing it). 



but it takes a bit of experience knowing what to search. depending on what are your needs, you can always right click and assign them on the fly. personally I never had a reason not do so.